Hi, my wife has a 5 year full thai licence and we got her a international driving permit from the Buriram transport office, she can drive on that and is insured through my car insurance for a 12 month period in the uk, after the 12 month period she must take the full uk driving test, but as we go back to buriram every 6 months to see the family she just keeps re-newing her international permit and she is good to go then for another 12 months and no uk test.